buf := make([]byte, 0, len(v))
	for i := 0; i < len(v); i++ {
		if b := v[i]; valid(b) {
			buf = append(buf, b)
		}
	}
	return string(buf)
}

// parseCookieValue parses a cookie value according to RFC 6265.
// If allowDoubleQuote is true, parseCookieValue will consider that it
// is parsing the cookie-value;
// otherwise, it will consider that it is parsing a cookie-av value
// (cookie attribute-value).
//